add the kw 'broken' to linkcheck help newbies debug errors

Author: mattip

newsfeed/demo/Makefile

@@ -158,8 +158,8 @@ changes:
 linkcheck:
 	$(SPHINXBUILD) -b linkcheck $(ALLSPHINXOPTS) $(BUILDDIR)/linkcheck
 	@echo
-	@echo "Link check complete; look for any errors in the above output " \
-	      "or in $(BUILDDIR)/linkcheck/output.txt."
+	@echo "Link check complete; look for any errors (like 'broken') in the " \
+		  "above output or in $(BUILDDIR)/linkcheck/output.txt."
 
 doctest:
 	$(SPHINXBUILD) -b doctest $(ALLSPHINXOPTS) $(BUILDDIR)/doctest